button to create a new polygon that traces around the outside of a group of contiguous polygons.Select all of the polygons to combine. Click the Draw | Edit Boundaries | Union Polygons command or click the button to create a new polygon that traces around the outside of a group of contiguous polygons.
Note, if the selected polygons do not contain any overlapping sections, no change is made after selecting the command.
To use the Union Polygons command:
Select all the polygons to be grouped together.
Click the Draw | Edit Boundaries | Union Polygons command.
The Union Polygons command traces
outside a group of selected polygons
(left) and creates one polygon (right).
The Union Polygons command differs from the Combine Islands/Lakes command. With the Union Polygons command, the outside boundary for the selected group of polygons is generated. All inner lines are removed. With Draw | Combine Islands/Lakes, the group is combined into a single complex polygon, but the outer boundary is not traced.
See Also